SUSE did $0.67B in 2022. It's a live and vibrant company that focuses on traditional Linux and its management. Though it has cloud & container offerings of course, I think SUSE's greatest strength is for people that want to use multiple Linux distros (Debian and Debian-likes, RH and RH-likes) and get support for all of them under one roof.

I don't know which particular customers are using it, but given the revenue, there must be _a lot_ of SUSE systems in the corporate world.